[TOMT][2000s][2010s] Well known actor with buzz cut who looks a bit like Josh Hartnett in Pearl Harbour or Mathew Fox in Lost

He's been in plenty of movies and shows but I can't for the life of me remember who he is.

Definitely during 2000s and 2010s.

He was a man with a shaved head aged in his 20s to 30s.

I feel like maybe he was in a procedural detective show and/or a military movie.

Extra random info that might be wrong:

Frowning a lot(?) Played underdog characters. Maybe one of his roles was acting as an older brother? I thought it was the older brother from Alien vs Predator Requiem but it wasn't.

Any help would be appreciated

(Edit): Thank you guys for all the suggestions!